激光雷达技术揭开玛雅古城隐藏之谜
From above, the dense tropical forests of northern Guatemala appear as an impenetrable green carpet, a wilderness that has swallowed centuries of human history. But beneath this arboreal shroud, a hidden geometry of causeways, plazas, and monumental pyramids has begun to emerge, not through the slow work of machetes and trowels, but via the precise pulses of airborne LIDAR—Light Detection and Ranging. This remote-sensing technology, which fires billions of laser beams at the ground and measures their return times, has stripped away the vegetation digitally, revealing a sprawling pre-Columbian landscape that challenges long-held assumptions about the scale and sophistication of Classic Maya civilization.
The breakthrough came from the Pacunam LIDAR Initiative, a collaborative project that in 2018 surveyed over 2,100 square kilometres of the Maya Biosphere Reserve. What the data exposed was staggering: a network of elevated roads, extensive agricultural terraces, defensive ditches, and an estimated 60,000 previously unidentified structures, all hidden under what appeared to be pristine forest. The sheer density of settlement suggests that the Maya lowlands supported populations far larger than earlier estimates, perhaps as many as 10–15 million people at the civilisation’s zenith around 700 CE. Such numbers could not have been sustained without sophisticated water management and intensive farming, pushing archaeologists to reconsider the region not as a collection of isolated city-states but as a highly interconnected, urbanised civilisation.
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